Paper container



H. J. REITER PAPER CONTAINER May 11, 1937.

Filed July 18, 1936 TNESS INVENTOR FTTGR/YEY condition for use.

Patented May II, 1937 PATENT oFFIcE PAPER comma Henry J. Reiter,Philadelphia, Pa., assignor to Brown & Bailey Company, Philadelphia,Pa., a corporation of Pennsylvania Application July 18, 1936, Serial No.91,353

8 Claims.

The present invention relates to paper containers for fluids and moreparticularly to paper milk bottles and the like which are rendered fluidtight and non-absorbent by the application of a fluid waterproofingagent during or after their manufacture and before they are placed inservice.

The invention provides a sanitary, serviceable paper milk bottle whichpreserves its impermeability to moisture for a relatively long periodand which may be manufactured sufiiciently cheaply to conform withmodern trade requirements. t

It will be understood that bottles of this character, to be practical,must remain impermeable to their fiuid contents for a sumciently longtime after they have been filled with milk or cream, sealed anddelivered to the customers,

to permit them to be used for storage of their contents until entirelyconsumed, even though this require several days, and many complaintshave been received from consumers to the effect leaks in bottleheretofore used have developed before their contents have been entirelyused, while others which have been found relatively satisfactory in thisrespect have been so expensive as to render their use prohibitive incost.

In that type of paper bottle to which this invention particularlyrelates the first of these disadvantages only has heretofore beenpresent for the cost of their manufacture is so low that they may beplaced on the market at very reasonable prices, and I have found that inmost instances where leaks have developed in the bottles, they haveoccurred in the region of the joint formed by the glue lap which retainsthe flat blank from which the bottleis made in formed up Moreparticularly, certain points at which the glue lap and the bottle wallto which it is secured have been bent in forming the top closure or sealfor the bottle, are especially susceptible to leaks of this kind, whichcan not be entirely prevented even by the exercise of greatest care toinsure a perfect joint between the glue lap and wall since the foldingof these parts in sealing the bottle sets up excessive strains in thematerial by reason of the sharpness in the angularity of the folds andthe combined thicknesses of the layers of material being folded. Thus,while but little difficulty is experienced at points at which folds aremade in but a single thickness of the material, the necessity ofproviding a double thickness thereof throughout a narrow striplengthwise of the bottle at the glue lap to permit the bottle to be heldtogether when formed up, has heretofore been substantially unavoidable.

The fiat blanks from which the bottles are made, after being cut from asuitable paper stock and scored along the lines of the folds'to be madetherein, are usually formed up and glued at the joints, and then dippedin or otherwise treated with a waterproofing material such as parafiineso as to provide a thin waterproof film on all their exposed surfaces;The waterproofed bottles are next chilled to set and solidify this film,and then delivered to filling apparatus where they may be filled withmilk or other fluid prior to closing and sealing of the top. The foldingof the bottle incident to the latter operation thus occurs while thewaterproof film is in a nonfluid state, and a break or separation in thefilm at or adjacent the glued joint, where a double thickness of theblank material is folded, may result, or the folding cause thelaminations of the stock in the glue lap to separate, in either caseexposing a surface of the stock not coated with the waterproofing agent,thereby permitting the bottle contents to be absorbed and-thuseventually soaking the paper and ultimately causing the bottle to leak,while in some instances the strain of folding causes an immediateseparation of the glued joint at the point of the fold, developing aleak immediately.

The principal object of the present invention, therefore, is to providea bottle of this character so constructed that thefolding of the topplaces substantially no undue strain on the glue lap whereby breaking ofthe waterproofing thereon. at the fold, separation of its laminationsand separation of the glue lap from the side of the bottle to which itis secured are minimized or prevented entirely, thereby inhibitingpermea-.

tion of the bottle contents through the paper of which the bottle ismade or their leakage through the joint formed by the glue lap.

A further object of the invention is to provide a milk bottle of thecharacter described so constructed and arranged as to provide for accessof the waterproofing agent into the fibers of the glue lap adjacent thepoints at which folds are subsequently to be made in sealing the bottle,whereby the waterproofing of these parts remains fully effective afterthe bottle has been sealed.

Another object is the provision in a milk bottle of the charactermentioned of means inhibiting the setting up of undue strain on the gluelap and adjacent parts tending to cause their separation from each otheror tearing apart of the stock of which they are made when the foldsincident to closing and sealing the bottles are produced.

Other objects. purposes and advantages of the invention will hereinaftermore fully appear or will be understood fom the following description ofcertain embodiments thereof in which reference will be had to theaccompanying drawing.

In the said drawing Fig. 1 is a plan view of a blank of preferred formembodying the invention and adapted to be formed up into a sanitarypaper milk bottle.

Fig. 2 is a perspective view of a milk bottle formed from the said blankafter closing and sealing its top.

Fig. 3 is afragmentary diagonal elevation of the bottle prior to fillingand closing.

Fig. 4 is a fragmentary detail of the blank on an enlarged scale.

Fig. 5 is a diagonal interior elevation of an upper corner of the sealedbottle shown in Fig. 2.

Figs. 6 and 7 are views generally corresponding to Figs. 4 and 5 butshowing a modified embodiment of the invention.

In the several figures like characters are used to designatecorresponding parts and scoring of the blank is indicated by dot anddash lines.

Referring now more particularly to the drawing, the blank B comprisesfour integral rectangular, substantially similar side panels I, 2, 3 and4 and a glue lap 5 extending along one edge of the panel 4, the panelsand glue lap being defined from each other by scoring. The lower ends ofthe panels'and glue lap respectively carry bottom fiaps 8, I, 8 and 9and a glue flap In, all of which. are separated from each other by cutsand from the panels and glue lap by scores, these flaps cooperating inthe usual way to complete the bottom of the bottle when formed up andglued together.

The upper ends of alternate panels i and 3 are provided withsubstantially similar extensions ii and i2 adapted to be folded betweenother extensions l3, l4 of panels 2 and 4 when the bottle is closed andthus provided with divergent angular score lines i5 and i6 meeting atthe center of a generally transverse obtusely angled score line H, andfrom this center a short score [8 extends to the center of adjacent edgeof the extension, which is also angled in substantial parallelism withthe score line IT. The extensions 13 and '4 carried by the panels 2 and4 are separated from extensions II and i2 on panels I and 3 by scorelines, and are transversely scored at H! in substantial alignment withthe scores l1. These extensions also carry locking tongues 20 and 20,the latter of which is separated from the extension l4 by a score 22 andis somewhat shorter, transversely, than the width of the extension.

In prolongation of the score 23 separating the extensions from thepanels, a knife score 26 extends transversely of the glue lap. butterminates short of its opposite edges and is made in such a Way thatthe fibers of the paper of the blank are cut through for an appreciabledepth below one surface of the glue lap but not entirely through to itsopposite surface. A full cut 25 extends angularly across the glue lapjust above the knife score 24 at an angle generally corresponding tothat of the scores l5 and IS with respect to the score 23.

' When this blank is formed up in making a milk bottle the glue lap 5 ispasted to the opposite edge of the panel I as the blank is folded on thescores at the sides of the several panels, with that surface of the gluelap the fibers in which aovaevc are cut by the knife score 24 contactingthe inner surface of panel I at its edge and the bottom flaps 8-H! arethen folded in and glued together,-

these operations being carried out conveniently in exactly the samemanner as heretofore in the forming of milk bottles of correspondingsize and shape.

The formed up bottle, as usual, is then immersed in hot parafiln orotherwise waterproofed by being subjected to the action of a fluidwaterproofing agent. During this treatment the knife score 24 and thecut 25 in the glue lap 5 offer for contact with the waterproofing agentsmall edge surfaces of the material, and as the latter is usually moreabsorptive in its edges than in its outer surfaces, the waterproofingmaterial enters the cuts and is absorbed edgewise through the paper foran appreciable distance from the cuts.

After waterproofing and chilling or other setting of the waterproofingagent the bottles are usually immediately filled approximately to thelevel of the score line 23 in the side panels and are then closed byfolding the extensions of the panels I and 3 inwardly between those. ofthe panels 2 and 4 prior to final sealing and since the glue lap 5 hasbeen glued to the panel I, its upper portion is folded alongsubstantially the same lines as that part of the extension II to whichit is secured, and thus along the lines of the knife score 24 and thecut 25. This operation opens the knife score 24 as shown at 26 as if theglue lap were hinged on the uncut portion of the material adjacent thescore, and prevents strain at this point, while the out 25 may spreadslightly and provide in effect a slot overlying the fold on score linel5; the impregnated edges of the material at these points are thusexposed to contact with the fluid contents of the bottle.

Their impregnation by the waterproofing agent,

however, prevents the absorption of the fluid in the bottle by thematerial and as all other interior surfaces of the bottle are alsocoated or saturated with the waterproofing agent the bottle presents nopoints at which its contents may permeate the material of which it ismade and thereby induce leaks.

Moreover, the ability of the cut 25 extending angularly through the gluelap to spread in response to the strain placed upon the latter when itis folded with the extension l2 along the score I 5 in registry with theout together with the hinging of the glue lap where it is bent along theknife score 24, forming groove 26 in Fig. 5, relieves any strain on theglue lap at these folds and prevents it from being pulled away from thepanel I and separation of the larninations of which it is formed, whilethe continuity of the waterproof film is also preserved through theavoidance of extreme folds in all parts of the bottle.

In the modified embodiment of the invention indicated in Figs. 6 and '7,the blank B is provided with a cut formed as an oblique V-shaped notch28 in the glue lap 5' adjacent the point corresponding to the cut 25 inthe glue lap 5 of the blank B, but in other respects is identical withthe latter. When the blank 3' is formed up and impregnated with-thewaterproofing agent, the latter permeates the material in the vicinityof the cut in the same manner as heretofore described and when thebottle is thereafter folded as shown in Fig. 7 the cut is slightlywidened, relieving any strain on the glue lap and preventing exposure ofunwaterproofed surfaces to contact with the bottle contents, the knifescore 24' opening outwardly adjacent its point of engagement with thefold in the panel I to form a groove 26' substantially similarly to theaction of the corresponding parts in the preferred embodiment of theinvention.

No specific mention has herein been made of the manner of finallysealing the bottle and this forms no part of the present invention, butit will be understood that the tongue 2i is usually folded inwardlybetween the edge of extension II on the panel I and the inwardly foldededges of the extensions l3 and I4 on the panels 2 and 4 and the tongueis thereafter folded over it. A fastener is then desirably insertedthrough the several thicknesses of material at the top of the bottle andcrimped over to hold them together and if, as is usually the case, theyare slightly warmed during this operation, the waterproofing agent maybe sufficiently softened to permit an entirely waterproof andsubstantially air tight seal to be effected.

While I have herein described the invention with considerableparticularity, and especially as it may be embodied in a box of acertain well known specific type, it will be understood that I do notdesire or intend thereby to limit or confine myself in any way thereto,as changes and modifications in the form, structure and arrangement ofthe several parts, in their mode of mutual association, and in theircooperative effect will readily occur to those skilled in the art andmay be made if desired without departing from thespirit and scope of theinvention as defined in the appended claims.

Having thus described my invention, I claim and desire to protect byLetters Patent of the United States:

1. In a disposable bottle formed from-a single unitary blank comprisingintegral sides, a bottom and extensions carried by the sides adapted tobe folded along predetermined lines to form a top closure, a glue lapintegral withone of the sides and its extension secured to a second sideand its extension and-having a transverse knife score aligned with thejuncture therebetween, and an angular cut extending in alignment withone angular line of fold in the-second extension.

2. In a disposable bottle formed from a single unitary blank comprisingintegral sides, a bottom and extensions carried by the sides adapted tobe folded to form a top closure, a glue lap integral with one of thesides and its extension secured to the adjacent side and its extensionand having a transverse knife score aligned with the juncturetherebetween, and a V-shaped notch extending angularly inwardly from itsedge toward the knife score having one of its sides aligned with acorrespondingly angular fold in the adjacent extension.

3. In a bottle formed of bendable material, an extension havinginter-folding portions adapted to be folded along predetermined lines informing a top-closure for the bottle, a glue lap extendinglongitudinally of the bottle and said extension having an angular cut inregistry with a correspondingly angular fold along one of saidpredetermined lines in the extension and a transverse knife score inregistry with a transverse fold between the extension and the adjacentportion of the bottle.

4. In a bottle formed of bendable material, an extension adapted to befolded along predetermined lines in forming a top-closure for thebottie, a glue lap extendlnglongitudinally of the bottle and saidextension having an angular out in registry with one of saidpredetermined lines in the extension and a transverse knife score inregistry with another such line between the extension and the adjacentportion of the bottle and a waterproof agent impregnating the materialan appreciable distance inwardly from said cut and score respectivelyand coating the interior surfaces of the bottle to thereby render thebottle substantially impervious to aqueous fluids.

5. In a bottle formed of bendable material, an extension havinginter-folding portions foldable along predetermined lines in forming atop-closure, a glue lap extending longitudinally of the bottle and saidextension having an angular V- shaped notch projecting inwardly from oneof its edges to a point adjacent an opposite edge. one side of the notchregistering with the fold along one of said lines in the extension and atransverse knife score registering with the fold along another of saidlines between the extension and the adjacent portion of the bottle.

6. In a bottle formed of bendable material, an extension havinginter-folding portions defined from each other by rectilinear folds informing a top-closure, a glue lap extending longitudinally of the bottleand said extension having an angular V-shaped notch projecting inwardlyfrom one of its edges to a point adjacent an opposite edge. one side ofthe notch registering with one of said folds in the extension and atransverse knife score registeringwith another fold between theextension and the adjacent portion of the bottle and a waterproof agentimpregnating the material an appreciable distance inwardly from saidnotch and score respectively and coating the interiorsurfaces of thebottle to thereby render the bottle substantially impervious to aqueousfluids.

'l. A blank for forming a disposable fluid container comprising aplurality of integral substantially rectangular panels adapted to formthe sides of the container, extensions respectively defined from thepanels by scores adapted to cooperate to form a top closure, theextension defined from one panel having angular scores to facilitate thefoldingjthereof, and a glue lap integral with another panel and itsextension having a transverse knife score in substantial prolongation ofthe score defining the angularly scored extension from its panel, and anangular cut adjacent said knife score adapted to register with one ofsaid angular scores and to overlie the fold along said score when thetop closure is formed by folding all the extensions along said scores.

8. A blank forforming a disposable fluid container comprising aplurality of integral substantially rectangular panels adapted to formthe sides of the container, extensions respectively defined from thepanels by scores adapted to cooperate to form a top closure, certain ofsaid extensions having angular scores and transverse scores tofacilitate the folding thereof, and a glue lap integral with one paneland its extension having a transverse knife score in substantialalignment with the score between said panel and its extension, and anangular substantially V-shaped notch extending inwardly and downwardlyfrom a point in an edge of the glue lap adjacent but above the knifescore at an angle to the latter substantially corresponding to the anglebetween the angular iii)

